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How to Save and Fill the Data in a ComboBox With Two Display Members in VB.net

In this tutorial, I will show you how to save and fill data in the combobox with two display members using Visual Basic 2008 and Ms Access Database. Displaying two members in the ComboBox is very easy, all you need is a concatenation function in a query.

Concatenation is a function that joins two or more fields in the table of the Ms Access Database.

The concatenation in the MS Access Database is, you have to put an operator (&) to concat the two or more fields.

To start with:

Open the Visual Basic 2008, create a new Windows Form Application. After that, add four Labels, two TextBoxes, button and a ComboBox. In the ComboBox, it is where you display the two fields in the table of Ms Access database and the two textBoxes, is where you write the records that will be saved in Ms Access database.

storeform

Double click the Form and do this code for the connection of MS Access Database to Visual Basic 2008 above the Form1_Load.

  1. 'connection of MS Access Database to Visual Basic 2008
  2.     Dim con As OleDb.OleDbConnection = New  _
  3.     OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" _
  4.                           & Application.StartupPath & "\test.accdb")
  5.  
  6.     'declaring the classes
  7.     'OleDbDataAdapter represents a set of data command and
  8.     ' the database that are use to update and fill the data source
  9.     Dim da As OleDb.OleDbDataAdapter
  10.     Dim ds As DataSet 'represent a cache in memory of data

Description : OleDb is a namespace of a class. Application in the application.startpath is providing the static method to manage the application. Startpath in the application.startpath is getting the executive file.

In the Form1_Load, do this code for filling the data in the ComboBox that has two display members.

  1. Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
  2.         'filling the data of a combobox in the first load
  3.         'openning the connection
  4.         con.Open()
  5.         'in this area, it is where the command happens for filling
  6.         'and updating data in the database
  7.         'and also the concatenation of a query.
  8.         da = New OleDb.OleDbDataAdapter("SELECT ID,(fname & ' ' & lname) as [Name] from member ", con)
  9.         ds = New DataSet
  10.  
  11.         'refreshes the row into the dataset
  12.         'to match those data in the table
  13.         da.Fill(ds, "test")
  14.         'defining what are the attributes of a combo box
  15.         With ComboBox1
  16.             'set the data source to this combo box
  17.             .DataSource = ds.Tables(0)
  18.             'set the fields of the table to display in a list control
  19.             .DisplayMember = "Name"
  20.             'set the actual value of a combo box
  21.             .ValueMember = "ID"
  22.         End With
  23.         'closing the connection
  24.         con.Close()
  25.     End Sub

And this code is for storing the data in the database.

  1. Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  2.         'for data storing
  3.         'openning connection
  4.         con.Open()
  5.         da = New OleDb.OleDbDataAdapter("INSERT INTO member (fname,lname) VALUES ('" & TextBox1.Text & "','" & TextBox2.Text & "')", con)
  6.         ds = New DataSet
  7.         da.Fill(ds)
  8.         'closing the connection
  9.         con.Close()
  10.         'calling the first load to refresh the record in the combo box
  11.         Call Form1_Load(sender, e)
  12.     End Sub

The database of this file is in the bin. You can download the complete Source Code.

DOWNLOAD HERE

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